Siegbahn, Karl Manne Georg (1886–1978)

Swedish physicist who was awarded the 1924 Nobel Prize in Physics for research
into X-ray spectroscopy. Siegbahn improved
techniques for measuring the wavelength
of X-rays and used these new methods to discover
groups of X-rays both less penetrating and with longer wavelengths than
had previously been thought possible. This discovery supported the shell
theory of atomic structure of the Danish physicist Niels Bohr
(see Bohr atom). In 1924 he also proved
the similarity between X-rays and visible light by showing that X-rays could
be refracted by a prism.